0510JS运算符

发布时间：2023-09-06 01:53责任编辑：胡小海关键词：运算符

var a = 10;var b = 10;var c = a + b;var d = "hello ";var e = "world";alert(c);alert(a + d);alert(d + e);

|--复合运算 += -= *= /= %=

var f = "10";
　　f = f + 2;　　f += 2;　　alert(f);

|-自增自减 ++ --
|--注意位置a = b++;(先赋值再自加) a = ++b;(先自加再赋值)

 var g = 5; g++; g = g + 1; g += 1; alert(g); var h = g++; h = g;(先执行) g++;(再执行) alert(h); var k = ++g; g++;(先执行) k = g;(再执行) alert(k);

|--关系运算符 > < >= <= !=(不等于) == (只判断数字,字符串类型的数字会当作数字型来判断) ===(会判断字符的类型)

var l = 3 >= 2;var p = 123;var q = "123";alert(l);alert(p != q);alert(p !== q );alert(p == q);alert(p === q );

|--逻辑运算符
|----逻辑非 ! (not)

var aa = 2;var bb = 3;var cc = !(aa >= bb);alert(cc);

|----逻辑与 && (and)

var dd = 2 >= 3; /*flase*/var ee = 4 >= 1; /*/true*/alert(dd && ee);

|----逻辑或 || (or)

var dd = 2 >= 3; /*flase*/var ee = 4 >= 1; /*/true*/alert(dd || ee);

|--三元运算符条件?值1(true):值2(false)

0510JS运算符

原文地址：https://www.cnblogs.com/zhangbaozhong/p/9021676.html